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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15464
Experience:  Have owned a repair shop for 25 yrs.
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I have an 88 Chevy pick up and the ac won't cool

Customer Question

I have an 88 Chevy pick up and the ac won't cool properly
Submitted: 1 year ago.
Category: Chevy
Expert:  AZTechBrian replied 1 year ago.

Does it cool at all? What exactly is it doing?

Customer: replied 1 year ago.
It cools but not as it should my pressures are way too high. The compressor orifice dryer and condensor have all been replaced pressures are 50 over 350 at idle
Expert:  AZTechBrian replied 1 year ago.

does it work better if you are driving above 55 or so?

Customer: replied 1 year ago.
I don't think the condensor is getting enough airflow
Expert:  AZTechBrian replied 1 year ago.

If it works good at cruising speeds, and not so well at a stand still, then I would agree with you totally. Although it might seem ok, the fan clutch is likely the problem. I would wash the condenser really good and make sure it's not plugged up with bugs, dirt etc. If and when that doesn't cure the problem I would replace the fan clutch.

Expert:  AZTechBrian replied 1 year ago.

also make sure the radiator is clean too. when your not moving, the fan has to push the air through the radiator to get to the condenser. Im sure you knew that, but it was worth mentioning

Customer: replied 1 year ago.
The fan on the vehicle is a flex style fan without a clutch I put in a n OE fan with a clutch and no change at all. I also wired in an aux fain in front of the condensor and still nothing my coolant operating temperature is around 210 if I cool the condensor with water the high side pressure drops drastically and the ac blows ice cold
Expert:  AZTechBrian replied 1 year ago.

a properly functioning ac system should cool more when the condenser is hosed off. what is the outside temperature right now where your at, and is your system r12 or has it been converted to 134a? can you put a thermometer in one of the vents and tell me what the temp is with the ac on?

Customer: replied 1 year ago.
It's about 85 degrees outside the center duct temp is around 70 degrees
Customer: replied 1 year ago.
R134a
Customer: replied 1 year ago.
It only has about 15 ounces of refrigerat in it
Expert:  AZTechBrian replied 1 year ago.

15 ounces of 134a? it should have 2.8lbs

Customer: replied 1 year ago.
Right pressure is too high already
Customer: replied 1 year ago.
More refrigerant is just gonna increase pressure Even more
Expert:  AZTechBrian replied 1 year ago.

i can't see it cooling at all with 15oz of freon. even hosing down the condenser. I will opt out. hopefully somebody else has a better idea

Customer: replied 1 year ago.
Thanx
Expert:  AZTechBrian replied 1 year ago.

wait, before I go, how did you determine that it only has 15oz of freon? the compressor shouldn't even cycle on at that point. Did you use a calibrated evac/recharge machine?

Customer: replied 1 year ago.
After I vacuumed the system I put a little more than a 12 ounce can of refrigerant in before my high side pressure skyrocketted
Expert:  AZTechBrian replied 1 year ago.

just to make sure i am understanding correctly, you have made sure the condenser and radiator are clean, and you have installed the OE fan and fan clutch and still this continues to be a problem? There has to be either a restriction in the high side of your ac system, or not enough air movement through the condenser since you have replaced the oriface tube i am leaning toward too little air movement

Customer: replied 1 year ago.
The condensor and radiator are new OE fan isn't installed at the moment but was installed without any change. When I flushed the system compressed air moved freely through the system so I didn't expect a blockage
Expert:  AZTechBrian replied 1 year ago.

well, i really wish I had an answer, but if your sure that the fans are moving enough air through the condenser, and that there is no blockage and that it's not over charged (which it would not be at less than a lb) then i am out of ideas without it being in front of me. Im probably missing something.

Customer: replied 1 year ago.
Had me stumped as well
Expert:  Gary replied 1 year ago.

New expert here did you still need help ?

2 things that i am curious about

1 ) is there 2.8 LBS of refrigerant in the system or 44.8 OZ ?

did you add any oil ?

2 ) is the stock fan shroud upper and lower still on the truck correctly ?

Customer: replied 1 year ago.
There is only about 16 ounces in the system the fan shrouds are installed still. It has a flex fan on it instead of the OE clutch style
Expert:  Gary replied 1 year ago.

did you say you tried another fan blade and clutch fan ?

this has all the signs of an air flow problem from the fan not drawing enough air across the condenser and radiator fins

it has to be as if you use water on the condenser the pressure drops right down

Customer: replied 1 year ago.
I put on an OE fan clutch and blade and the same issue
Customer: replied 1 year ago.
the pressure drops right aawaaaay when the condensor is cooled
Expert:  Gary replied 1 year ago.

how far when the clutch fan and oem blade into the shroud and how far from the radiator ?

was the fan clutch you tried brand new ? what did the blade come out of ?

again when it will drop down that fast when cooled there is not enough air being drawn through the fins

when at idle and the ac on that clutch fan should be almost roaring being fully locked

Customer: replied 1 year ago.
The clutch was purchased from advance auto parts the blade came off of the an identical vehicle and it was a 5 blade fan. There isn't a way to extend the clutch away from the water pump to get it closer to the radiator. the flex fan is installed with a spacer to compensate for the distance of the clutch
Customer: replied 1 year ago.
I also wired an electric fan in front of the condesor and no change
Expert:  Gary replied 1 year ago.

ok i wanted to be sure the fan blade and clutch were in far enough of the shroud

did this ac ever work fine with the flex fan in place ?

and the fan in front is pushing air through the fins ?

Expert:  Gary replied 1 year ago.

brand new orifice tube filter installed and installed correctly ?

Customer: replied 1 year ago.
I'm not sure this is a vehicle I'm working on. I put on a new compressor orifice tube and dryer. I also flushed the system today. When I pulled the orifice it was covered in metal
Expert:  Gary replied 1 year ago.

as long as it has a new orifice tube the one that slides into the condenser port

is there anyway to fine out when the last time this ac system worked ?

can you be sure the fan in front of the radiator is pushing air into the engine compartment direction of air flow

Customer: replied 1 year ago.
The orifice on this one goes into a line just above the wheel well on the passenger side.
Expert:  Gary replied 1 year ago.

ok

we ca see if another expert has any more ideas

hang on another expert will reply back to you

im sorry i could not help

Expert:  Tim's Auto Repair replied 1 year ago.

Hi, My name is ***** ***** for the delay.

I will do my best to assist you

ok,,from the beginning here..

tell me,,right now how much pressure do you have on the low side with the a/c on at an idle?

why did you replace the compressor?

Customer: replied 1 year ago.
Low side is at 50psi. Compressor was replaced based on the diagnostics from an ac shop. They say the front seal was leaking
Expert:  Tim's Auto Repair replied 1 year ago.

ok,the condenser,orifice,and dryer are new?and you flushed the system?

Expert:  Tim's Auto Repair replied 1 year ago.

also,tell me,how much 134 did you put into the system.this was originally a r12 system,,right

Expert:  Tim's Auto Repair replied 1 year ago.

you say there was medal in the orifice?please explain.

did the a/c work before the work was done?

Customer: replied 1 year ago.
15 ounces
Expert:  Tim's Auto Repair replied 1 year ago.

ok

Expert:  Tim's Auto Repair replied 1 year ago.

ok,the condenser,orifice,and dryer are new?and you flushed the system?

31 Aug 2015, 9:27 PM

Me

also,tell me,how much 134 did you put into the system.this was originally a r12 system,,right

31 Aug 2015, 9:28 PM

Me

you say there was medal in the orifice?please explain.

did the a/c work before the work was done?

Expert:  Tim's Auto Repair replied 1 year ago.

are you there?

Customer: replied 1 year ago.
it worked before just had the same problem.
Customer: replied 1 year ago.
15 ounces of r134 is in the system
Expert:  Tim's Auto Repair replied 1 year ago.

ok,the condenser,orifice,and dryer are new?and you flushed the system?

Expert:  Tim's Auto Repair replied 1 year ago.

you say there was medal in the orifice?please explain.

did the a/c work before the work was done?

Expert:  Tim's Auto Repair replied 1 year ago.

are you there?

Expert:  Tim's Auto Repair replied 1 year ago.

you arent talking to me

Customer: replied 1 year ago.
the system has been flushed and everything has been replaced
Expert:  Tim's Auto Repair replied 1 year ago.

ok,,here is what i want you to do,,i want you to blow the system and start all over

Customer: replied 1 year ago.
What does that mean
Expert:  Tim's Auto Repair replied 1 year ago.

get the 134a outa there and start over

Expert:  Tim's Auto Repair replied 1 year ago.

i want you to put 37.5 oz in the system after you vacuum

Expert:  Tim's Auto Repair replied 1 year ago.

134 expands at 20% more than r12

Customer: replied 1 year ago.
The pressures are already too high with 15 ounces
Expert:  Tim's Auto Repair replied 1 year ago.

meaning that an oz of 134 is nore than an oz of r12

Expert:  Tim's Auto Repair replied 1 year ago.

im not worried about the pressures at the moment,,it isnt gong to work with it half full

Expert:  Tim's Auto Repair replied 1 year ago.

what fan are you using now??still have the electric fan on it?

Expert:  Tim's Auto Repair replied 1 year ago.

on the condenser.

Customer: replied 1 year ago.
Took the electric fan off
Expert:  Tim's Auto Repair replied 1 year ago.

ok,,clutch?

Expert:  Tim's Auto Repair replied 1 year ago.

does it have a fan shroud on it?

Customer: replied 1 year ago.
Yeah shroud is in place
Customer: replied 1 year ago.
No clutch
Customer: replied 1 year ago.
Its a flex fan
Expert:  Tim's Auto Repair replied 1 year ago.

ok,,i really needs the clutch

Expert:  Tim's Auto Repair replied 1 year ago.

it will pull more air at an idle

Expert:  Tim's Auto Repair replied 1 year ago.

do you have the system dried out yet?

Customer: replied 1 year ago.
I put a clutch fan on it to fix this issue and it did nothing so I took it off
Expert:  Tim's Auto Repair replied 1 year ago.

if it doesnt work after you recharge it with 37.5 oz and the orifice,condenser and the dryer is new,...

Expert:  Tim's Auto Repair replied 1 year ago.

i want you to replace that compressor,,i

Expert:  Tim's Auto Repair replied 1 year ago.

i would think some of the medal you found in the orfice made its way to the new compressor or it just isnt good

Expert:  Tim's Auto Repair replied 1 year ago.

again,,install the clutch fan ,put in 37.5 oz

Expert:  Tim's Auto Repair replied 1 year ago.

i that compressor is good,,it will work

Customer: replied 1 year ago.
The metal was flushed out before I even installed the new compressor
Expert:  Tim's Auto Repair replied 1 year ago.

still yet,,if you put 37.5oz in the system with the clutch fan it will work,if not,replace that compressor

Expert:  Tim's Auto Repair replied 1 year ago.

thanks

Customer: replied 1 year ago.
The pressures are already too high to add more refrigerant
Expert:  Tim's Auto Repair replied 1 year ago.

if it gets too high it will blow out,,i look for the pressures to drop

Expert:  Tim's Auto Repair replied 1 year ago.

if not,,we know the system is clogged,,,you have a new orifice,condenser and dryer,,if it doesnt work,,the compressor is the problem,,there isnt anything else left

Expert:  Tim's Auto Repair replied 1 year ago.

it isnt going to work half full

Expert:  Tim's Auto Repair replied 1 year ago.

i would like for you to start over to make sure you vacuum the system well so we know there is no dampness in it,,to rule out a freeze up problem

Expert:  Tim's Auto Repair replied 1 year ago.

thanks

Expert:  Tim's Auto Repair replied 1 year ago.

by the way,,the 134 is not going to cool as good as the r12 anyways..but,,it should be cold

Customer: replied 1 year ago.
Ok
Expert:  Tim's Auto Repair replied 1 year ago.

let me know how it gos

thanks

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Customer: replied 1 year ago.
I replaced the fan with a clutch fan and charged the system still the same thing. It was cold until the vehicle got to operating temp
Expert:  Tim's Auto Repair replied 1 year ago.

if you put the 37.5 oz in it an sense all is new,,i would think that pump is no good

Customer: replied 1 year ago.
I'll swap it out again
Expert:  Tim's Auto Repair replied 1 year ago.

ok..let me know,,,

Customer: replied 1 year ago.
Replaced everything still no go. How can I check for a system blockage the only place that I think one may be is in the condensor but the condensor feels warm. All over
Expert:  Tim's Auto Repair replied 1 year ago.

you said you installed a new condenser..correct?

Customer: replied 1 year ago.
Right but the pressures are rising too quickly like the system is smaller than it should be
Customer: replied 1 year ago.
The pressures only increase when the vehicle heats up. Thus morning while the vehicle was cold everything worked well
Expert:  Tim's Auto Repair replied 1 year ago.

how much 134 do you have in it this time?

Expert:  Tim's Auto Repair replied 1 year ago.

this isnt making allot of sense,,it does sound like a bad condenser,,but,you have already replaced it.

Customer: replied 1 year ago.
I'm gonna replace the condensor again
Expert:  Tim's Auto Repair replied 1 year ago.

let me know how it gos

thanks

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